Light guide mechanism for guiding a light to an illuminance sensor

1. A light guide mechanism for an illuminance sensor, comprising:

a lighting window configured to pass through an external light;

the illuminance sensor configured to detect an illuminance of the external light passed through the lighting window; and

a light-blocking part provided between the lighting window and the illuminance sensor and configured to block a light other than the light passed through the lighting window, which travels toward an inner space from outside the light-blocking part, the inner space being formed at least by the light-blocking part,

wherein the light-blocking part has an inner surface inclined with respect to a line perpendicular to a light-receiving surface of the illuminance sensor, and a direction of inclination of the inner surface that faces the light-receiving surface of the illuminance sensor.

2. The light guide mechanism according to claim 1 , wherein the inner space includes an empty space having a circular or polygonal cross section, and at least a part of the empty space is inclined with respect to the line perpendicular to the light-receiving surface of the illuminance sensor so that a cross sectional area of the empty space increases toward the illuminance sensor.

3. The light guide mechanism according to claim 1 , wherein an inclination angle of the inner surface of the light-blocking part is determined based on an amount of light reflected by the inner surface of the light-blocking part and incident on the illuminance sensor.

4. The light guide mechanism according to claim 1 , wherein the light-blocking part is integrally formed with a housing to which the lighting window is provided.

5. The light guide mechanism according to claim 1 , wherein a display device is arranged in a vicinity of the illuminance sensor, and a part of the display device forms a part of the light-blocking part.

6. The light guide mechanism according to claim 1 , wherein the illuminance sensor is provided inside a device housing, and a part of the device housing forms a part of the light-blocking part.

7. The light guide mechanism according to claim 1 , wherein the lighting window is formed of a material, which transmits a light while scattering the light.

8. A mobile phone comprising:

a housing; and

a light guide mechanism provided in the housing,

wherein the light guide mechanism includes,

a lighting window provided in the housing and configured to pass through an external light;

an illuminance sensor provided in the housing and configured to detect an illuminance of the external light passed through the lighting window; and

a light-blocking part provided between the lighting window and the illuminance sensor and configured to block a light other than the light passed through the lighting window, which travels toward an inner space from outside the light-blocking part, the inner space being formed at least by the light-blocking part,

wherein the light-blocking part has an inner surface inclined with respect to a line perpendicular to a light-receiving surface of the illuminance sensor, and a direction of inclination of the inner surface that faces the light-receiving surface of the illuminance sensor.

9. The mobile phone according to claim 8 , wherein the inner space includes an empty space having a circular or polygonal cross section, and at least a part of the empty space is inclined with respect to the line perpendicular to the light-receiving surface of the illuminance sensor so that a cross sectional area of the empty space increases toward the illuminance sensor.

10. The mobile phone according to claim 8 , wherein an inclination angle of the inner surface of the light-blocking part is determined based on an amount of light reflected by the inner surface of the light-blocking part and incident on the illuminance sensor.

11. The mobile phone according to claim 8 , wherein the light-blocking part is integrally formed with the housing to which the lighting window is provided.

12. The mobile phone according to claim 8 , wherein a display device is arranged in a vicinity of the illuminance sensor, and a part of the display device forms a part of the light-blocking part.

13. The mobile phone according to claim 8 , wherein a part of the housing forms a part of the light-blocking part.

14. The mobile phone according to claim 8 , wherein the lighting window is formed of a material, which transmits a light while scattering the light.